Electric storage battery



March l 7,

1931. .1. L. wooDBRlDGE ELECTRIC STORAGE BATTERY Filed June 20, 1927 Patented Mar. 17, 1931 JOSEPH LESTER WOODBRIDGE, OF PHILADELPHIA, PENNSYLVANIA ELECTRIC STORAGEBATTEBY Application Med Iune 20, 1927. Serial Io. 199,941.

This application is a continuation in part of my application Serial No. 146,109, led November 4, 1926, and allowed February 1o, 1927.

6 My invention relates to storage battery cells in which the elements are assembled in a suitable container provided with a closure, throu h which closure the terminals project `in erger to provide electrical connection to 10 an external circuit, and it has for its object the provision of a more effective and permanent seal between the terminal post and the cover for preventin theescape of the electrolyte in the cell. T is and other objects of the invention will be apparent from the following description taken in connection with the accompanying drawing, in which Figure 1 is a view partly in section of a terminal post seal involving features of the invention and showing the same assembled but not in final position.

Figure 2 is a similar view showing the parts in final position; and

Figures 3 and 4 are similar views showin modifications not in final positions.

n the drawing 1 designates a portion of the cover of a storage battery cell, having a circular opening at 2, through which projects the terminal post 3, there being provided or occurring an annular crevice, space, or clearance between the rim of the hole and the surface of the post. The post 3 is provided with screw threads 4` adapted for engagement with the seal nut 5. At the A 85 base of the terminal post 3 is a shoulder 11 beneath which the post extends to the strap or connecting bar 9 to which the storage battery plates 6 are attached. Other details of the cell have been omitted, as they are not necessary for a full understanding of the invention.

Referrin to Figures 1 and 2 a washer 7 of lead or ead alloy is shown surrounding the post 3 just above the shoulder 11 which washer as shown in those figures of the drawing and as first applied is conical or dished 1n shape with the concave surface upward, thus providin a cavity between the u per concave sur. ace of this washer 50 and t e cylindrical surface of the post 3 and the under surface of the cover 1. This cavity is filled with a semi-fluid material 8 such as grease er other similar material which is inert, non-conducting and im ervious to the electrolyte in the cell.

his

mass of grease may be a plied to the washer after it'1s in place, resting on the shoulder 11 and before the cover 1 is applied by pouring the molten vi e rease into t e space prod for it, an then allowing 1t to cool and stiifen; or it may be applied by dipping the washer 7 into the grease or similar material in a semi-fluid state before the washer is placed in position, or in any other convenient manner.

After the parts have been assembled as shown in Figure 1 of the drawin the seal nut 5 is screwed down, forcin t e washer 7 to flatten down on the shoul er 11. This process will at first force the cover with considerable pressure against the upper edg e of the washer 7 thus preventing the escape of the grease from this point. The

low the 11,

this point. grease will be forced upward into the ace 10 between the cover and the post fislll this space to such an extent as to er and inner edge of the washer 7 will at same time be forced against the shoulder preventin the escape of the grease at he resultv will be that the ing orm an effective seal between the post and the cover prevent the escape of the electrolyte from dep ression or cavity which is l ed with grease and the cover itself which is slightly ible is deformed and pressed down into this cavity when the seal nut is screwed down thus forcing the rease up into the annular space between t e ost and cover.

In Figure 3 the under sur ace of the seal nut is conical to produce this deformation of the cover, and in Figure 4, a slight rim is .raised on the cover around the opening inst which'the seal nut bears, thus` forcthe cover down into the recess of the ar on the post.

It has heretofore been the custom to use a. washer or gasket of soft .rubber between the shoulder l1 and the cover l but this device has not proven entirely satisfactory owing to the fact that the rubber will eventually harden and assume a permanent form, losing its resiliency and thuspermitting spaces to develop between the Washer and the cover and the post through which electrolyte may escape. The invention described above obviates these disadvantages and provides an inex ensive and effective means and method or permanently sealin the joint between the terminal post an the cover.

I claim:

1'. The method of sealing the space between the surface of a shouldered storage battery terminal post and the rimof the hole inthe cell closure through which the post passes, which consists in arranging a supply of semi-fluid sealing compound in a cavity arranged in roximity and in communication with sai space, and injecting 'the comoundl from 'the cavity into said space by deformation 'of one of the walls of the 2. l'ea'ns for sealin the space between thes'urface of'a shoul ered storage battery terminal post yand the rim of a hole in a storage batter 'closure through which the post passes, w ich means comprise a dished receptaclearranged under the cover in confronting relation to said space and adapted to contain a Asup ly of semi-fluid sealing compound and'de Ormable provisions' adapt-A ed upon deformation to inject the compound into the space. j

3. The methodof'sealing the space between the surfacejof a cupped shouldered storage battery terminal post and the rim of the hole in the cell .closure through which the post passes, which consists in arranging a supply of semi-Huid sealing compound in the ycavit between the cupped shoulder andthe un er surface ofthe closure and injecting the compound from the cavity into said space by deforming the closure into said cavit 4. combination a battery terminal post having a cupped shoulder, a deformable closure perforated to receive the terminal post above the shoulder, asem-iuid sealing material in the cupped cavity of the shoulder, and means for eforming and forcing the closure into said cavity whereby the compound is forced into the space between the post and the rim of the hole in the closure.

5. The method of sealing the space between the surface of a cupped shouldered storage battery terminal post and the rim of the hole in the cell closure through which the post passes, which consists in arranging a, supply of semi-fluid sealin compound in the cavlty between the cuppe shoulder and th'e under surface of the closure, placing the lip of the shoulder on the terminal post against the under surface of the closure and in'ecting the compound from the cavity into said space by deforming the closure into said cavity.

6. In combination a battery terminal post JOSEPH LESTER WOODBRIDGE. 

